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If the mean height of 3 boys is 142 cm. and the mean height of another 7 students is 145 cm., then the mean height of 10 students.

A) 144 cm 

B) 144.1 cm 

C) 144.2 cm 

D) 144.4 cm

2 Answers

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Best answer

Correct option is (B) 144.1 cm

The mean height of 10 boys \(=\frac{3\times142+7\times145}{10}\)

\(=\frac{426+1015}{10}\)

\(=\frac{1441}{10}\) = 144.1 cm

+1 vote
by (40.5k points)

Correct option is  B) 144.1 cm

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